Pier door



, 1,454,126 L. MCHARG PIER Doon Filed Aufl.l 30, 1921 2 Sheets-Sheet. 2 I

50 I have illustratedin4 LESLIE MQHARG,` l? FREEPORT, NEW YORK.

PIER noon.-

Ap'piicatim med August 3o, i921. serial No.- 496,891.

To all whom it may concern: 1

Be it known that I,LEsLIn Mol-Inno, a citizen of the United States of America, re-

siding at Freeport, inthe county of Nassau 5 and State of New York, .have invented certain new and usefu Improvements in Pier, Doors, of which. t e following isa full,

clear, and exact description.

In a patent granted tome shown and described an improved pier door composed of two sections, an upper and a lower, With means for raising the lower section until it completely overlaps the upper, and then raising both sections to fully vopen the door, by guiding both from a vertical into a horizontal position. Under ordinary conditions such as are met with in piers, freight warehouses and the like, the

use of such double doors'is neoessary, but

undercertain other conditions this 1s a mere complication that may be avoided .by the use of a single door section to accomplis all the desired results.

Single section doors for this purpose, however, may be required to be heavy and large, and without special provision tothe con- "trary they will require rmuch more head room over the door than' is usually available for opening. vTheir mass and weight are so great as to needoounterbalancing .to obviate the expenditure of great' force in raising them, and they must be always guided and restrained so as not to be ca. 3'5 pable of any lateral movement, otherwise they might blow open in a strong wind, or

be `forced into an inclined position by anyl weight or pressure applied to them.

To meet all the practicable requirements Y 4.0 of such a door, I have devised a single section pier door with means for opening and closing the same, which embody the principle of the construction and operation of the`d0ors of they patent -above referred to but which means are so modified as to operate more easilyandalso mfmeet the conditions which prevail in the case of a single section, that are not met with in the caseof two section doors, and this improvement he present application and defined in the -appended claims.

In the accompanying drawing, Fig. 1 is a side view of my improved door; Fig. 2 is a section of the same on the line A 2 2 of Fig-1;

onthe 22nd 10 o f February, 1921, No. 1,369,425, I 'have Fig. 3 is a view of the door in front elevation; f

Fig. 4 is an enlarged detail view ofthe special lifting means.

The' door is.composed of a single section 1of the usual form, dimensions andcon-v struction. Above it and lto one side is a shaft 2 supportedl by brackets or hangers 8 with bearings carrying loosel; mounted sleeves 11 in which the shaft 2 freely turns.l

To the shaft -2 is fixed a sprocket wheel '3 which is driven by a chain belt'from a pinion-sprocket 4' o n a short shaft 5 `whic'h-cari, i

ries a chain sprocket 6 over which runsl an endless engaging chain 7 by means of which rotary'motior is imparted to the said shaft 5 and from that to shaft 2;

On the shaft 2 are keyed two x'ed sheaves 9,'and to the sleeves 11 are secured, as by set screws, two sheaves 10 which turn freely with said sleeves and about the shaft 2.

Chains 12 are connected at one end to each 1 edge or side of the door 1 near the bottoni at 18 and at theother atA 17 at the middle of the door. These chains pass over both sheaves and around" a third or idler sheave 13, from which are suspended weights 14, suiiicient at all times to counterbalanee the weight of the door.

Thev door attop and bottom -on each side is provided with brackets 15 carrying rollers that travel inside guides 16.l These guides end to said edges are vertical to a point'sufficiently above the normal position of the door, and are then properly curved into horizontal portions, so that .as the kdoor is raised it shifts from a vertical into a horizontal position, 'ing substantially the position shown in dotted lines in Fig. 1 when fully opened.

When the door is to be opened the chain 7 is pulled by hand and the fixed sheaves 9,

occupythus rotated.Y This raises the door and permits the-weights 14 to descend. The weights pull up on the chain ends which are connected to the middle of the door aswell as upon those ends connected-to a point near the bottom, so that comparatively little forceis re-.`

quired to turn the shaft 2 and its fixedl pulleys. This counterbalancing effect continues .until the door is fully opened, and the same force is exerted to close the door when the shaft 2 is rotated in the opposite direction.

`-In' my previous construction the loose sheaves 10 were mounted directly on the shaft 2 and turned on that shaft as a beary i ing.

the friction adds .very materially to the ply great force 'sheaves fixed to amount of applied force necessary to-operate the door, and interferes in other ways with its use. By. lusing the sleeves l1, which turn freely in the hangers 8 and which afford bearings forthe shaft 2, these objections areentirely avoided and milch better.

results' are secured.

This is an extremely simple, but. a most effective device, and meets a want' which has long existed in the ready :and easy operation of doors of this character. In fact with the means and methods heretofore in use for thispurpose, 'it was either necessary to apto overcome friction and the weight of the door or to use devices of too complicated and expensive a nature t0 permit of their general or extensive use. lVVhatI claim is:-4 f

1., The combination with a pier door, of a shaft with means fo-r rotating the-'same for ening or closing the door, sleeves rotataly mounted in stationary bearings andaf# fording the bearings in which the shaft turns, two sheaves fixed to the shaft, two

over said sheaves and connected at rtheir the sleeves, chains running ends tothe bottomand. middle pointsof the sides of the door, idler sheaves carried by the chains, counterbalancing weights suskpended from said idler sheave's'and guides fer said door by whichv it is shifted when rismg from, a vertical to a horizontal position.

" 2. The combination-with a single section pier door7 of ashaft above and to one side of the same, means for 'rotatingsaid shaft when the door is to be opened or closed, two sleeves .rotatably mounted inv stationary bearings through which the said shaft'passes and freely turns, two sheaves keyed to the ends of the shaft, two sheaves fixed tothe ends ofthe sleeves projecting from the stationary bearings', .chains running over both sheaves and connected to the single section `at the bottom and middle points, vidler sheaves carried bythe chains, counterbalancing weights .suspended from the idler -sheaves and guides .for said door-.by which its upper edge is carried. from the vertical to the horizontal portion of said guides and th'e'door thereby shifted, when raised fromy 'a' vertical to ahorizontal position.

Inl testimony whereof I hereto aiiix my signature.

' LESLIE MCHARG; l 

